The Doctor's Accidental Family (Harlequin American Romance Series #1563)

SINGLE DAD DILEMMA 

After a disastrous relationship, Nurse Zady Moore just wants a family of her own and a guy with no baggage. With a young, vulnerable son, Dr. Nick Davis is exactly the kind of guy she should avoid. But his offer is too good—free rent in exchange for occasional babysitting. And it comes at the right time, just as Zady's young goddaughter comes to stay with her. It's only for six months—surely she can resist Nick's charms. 

Nick likes Zady, and he enjoys the camaraderie of chasing after two little kids with her. But she works for his hated cousin, and with a battle brewing between departments at Safe Harbor Medical, can Nick trust that Zady's loyalties lie with him?